Thousands of protesters in New York demanded an end to income inequality and housing foreclosures. Police fired tear gas to disperse marchers in Oakland, Calif. And black-clad demonstrators smashed windows in Seattle and occupied a building owned by the Catholic archdiocese in San Francisco.

The most visible organizing effort by anti-Wall Street groups since Occupy encampments were dismantled last fall are being planned for May Day, a change from recent years when protests on the international workers’ holiday focused on immigrant rights.